禁用button并移除onclick事件

//当查询字段“核对状态”限制为已核对时，将“自动核对”按钮置灰，不可点击
                function disableAutoSettlementBtn(a){
                    if($("#flowStatus").val() == 'CHECKED'){
                        $("#btn_auto_settlement").attr("disabled", "disabled").unbind();
                        $("#btn_auto_settlement").removeAttr("onclick");
                    }else{
                        $("#btn_auto_settlement").removeAttr("disabled").on("click", function () {
                            autoSettlement();
                        });
                    }
                }